[Bug target/19102] [3.4 Regression] -march=pentium3 breaks linux kernel compiles w/ gcc-3_4-branch as of 2004/12/20

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-12-22 
12:24 -------
Why do we allow MMX modes in SSE regs now?  The following patchlet is sufficient
to fix the problem:

Index: config/i386/i386.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/i386/i386.c,v
retrieving revision 1.635.2.18
diff -u -p -r1.635.2.18 i386.c
--- config/i386/i386.c  20 Dec 2004 05:37:36 -0000      1.635.2.18
+++ config/i386/i386.c  22 Dec 2004 12:21:42 -0000
@@ -14931,9 +14931,7 @@ ix86_hard_regno_mode_ok (int regno, enum
          out of SSE registers, even when no operation instructions
          are available.  */
       return (VALID_SSE_REG_MODE (mode)
-             || VALID_SSE2_REG_MODE (mode)
-             || VALID_MMX_REG_MODE (mode)
-             || VALID_MMX_REG_MODE_3DNOW (mode));
+             || VALID_SSE2_REG_MODE (mode));
     }
   if (MMX_REGNO_P (regno))
     {


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19102